DIRECTIONSPreheat oven to 425 degrees.Place tuna on a parchment lined baking sheet; drizzle with 2 tsp. oil. Season, with salt and pepper. Roast tuna until just cooked through, 8 to 10 minutes.Stir together radish, cucumber, horseradish, scallions and remaining tsp. of oil until combined. Season with salt and pepper. Serve with tuna.Serves 6.